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Washington CDL Permit Test - Combination

Number of questions: 20
Passing score: 16
Directions: All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Washington State Department of Licensing Commercial Driver Guide. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 20 multiple-choice questions, and applicants will need to correctly answer a minimum of 16 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
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1.

When braking with ABS, you should:

Push the brake pedal harder than usual.
Push the brake pedal as you normally would.
Push the brake pedal more lightly than usual.
2.

If an air supply control is in its "emergency" position:

The vehicle will increase speed.
The trailer emergency brakes will be applied.
The air supply to the trailer will increase.
3.

After completing a pre-trip inspection, you should ensure that the:

Service line valve is closed.
Trailer hand brake is applied.
Emergency line valve is open.
4.

What is a bobtail tractor?

A tractor without a trailer
A tractor attached to two trailers
A tractor with a tank
5.

Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:

The trailer will stop normally.
The trailer will not have brakes.
The trailer will speed up.
6.

Before a trip, you can make sure air flows to all trailers by:

Checking for moving air inside of each trailer.
Listening for air at the rear shut-off valve.
Feeling for air at the front shut-off valve.
7.

A driver should test the tractor protection valve by:

Pulling the yellow, diamond-shaped knob.
Releasing air with the brake pedal.
Unlocking the trailer doors.
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